How do I deactivate a subscription on a sold device?

There are 8 active devices in the subscription. Some have already been sold to a new owner. How can I request the new owner to use my subscription? There is no access to the sold devices.

Can’t anyone tell me how to disable subscriptions on some devices?

First, I’m an Avast user and not an Avast Team member and I use Avast Free so have no personal experience of this.

I’m also confused as your title “How do I deactivate a subscription on a sold device?”
This title doesn’t match the text of your 1st post “How can I request the new owner to use my subscription?” which is the opposite. So clarification in this regard is needed.

Nor if it would be breaking the terms of your purchase, effectively selling it on to a 3rd party I believe would be breaking the terms of your purchase.

Even if it was permitted I’m not sure that this is possible or possibly wise as they would all be linked to your Avast Account/subscription and this would possibly leave your email hanging in the wind.
Nor if it would be breaking the terms of the

That said to do that they would have to log on to your Avast Account this would be exposing your email address linked to your account.